Shell-grinder.



F. DI GIANNI.

SHELL GRINDER.

APPLICATION FILED rmms, 1914.

1,109,405, Patented Sept. 1, 1914.

2 SHEETS-SHEET l.

\ I IIIIIII F. DI GIANNI.

SHELL GRINDER.

APPLIOATION FILED FEB. 25, 1914.

2 SHEETS-SHBET 2.

Patented Sept. 1, 1914.

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UNITED STATES PATENT orrion.

FRANK m GIANNI, or Museums, IOWA.

SHELL-GRINDER.

I '0 all whom it may concern Be it known that I, FRANK D1 GIANNI, a. citizen of the United States, residing at Museatine, in the county of Muscatine and State of Iowa, have invented certain new and useful Improvements in Shell-Grinders; and I hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, which form part of this specification.

This invention is a novel improvement in machines for grinding irregularly shaped bodies of shell and the like; and its object is to provide a machine which can be easily operated; 'and in which all the .parts are readily adjustable and accessible.

I will explain the invention in detail with reference to the accompanying drawings, and will summarize the invention in the claims following the description. Figure 1 is a front elevation of the complete machine. Fig. 2 is an enlarged side view thereof. Fig. 3 'isa section on line 3-3, F ig. ,2. Fig. 4 is a top plan view of the machine showing the different arrangements of the grinder.

The machine has a base plate 1. Mounted upon this base is a swingable frame which consists of abifurcated casting 2, the lower end of the shank of which is pivoted or hinged on the base; and it is shown as pivoted on stud bolts 3 tapped through lugs 1' rising from the base 1. The bifurcations 2 of this frame 2 are bored for the passage of a shaft at, which is-preerably mounted therein by means of ball-bearings, comprising outer races 5, balls 5 and inner races-5 The races 5 are screwed into the outer ends of .the openings in the bifurcations, and the inner races 5, fitted into the outer races and screwed upon exteriorly threaded portions 4 of shaft 4; in this way :the shaft 4 is mounted rotatably in the frame 2 and is also held against longitudinal play therein.

On the shaft 4, intermediate the birfurcations 2 is fixed a gear 4; and collars or disks 4' may be placed on the shaft at each side of the gear 4. to fill the spaces between said gear and the adjacent ends of the bifurcations 2.

A tapered collar 6 may be placed on one end of the shaft and abut against one ofthe bifurcations to relieve the shaft of endthrust, said collar being secured by a setscrew 6. 'On the other end of the shaft is Specification of Letters Patent.

Application filed February 25, 1914. Serial No. 820,917.

Patented Sept. 1, 1914..

attached a removable cam 7, which should I the shaft by means ofa screw 1. In practice a number of interchangeable cams 7 will be provided with each machine; so that a different shaped article can be ground thereon.

The ball race 5 at the cam end of the shaft may be secured in position by means of a washer 4 slidably keyed to the shaft, and a jam nut 4 screwed on the shaft as shown.

The cam 7 is adapted to contact with an abutment 7 b on the upper end of a bar or bracket 7, the foot of which is slotted at 7 and secured to a lateral extension 1 of the base 1, by means of set bolts and washers 7 so that the abutment 7 can be adjusted tov ward or from the shaft 4.

The frame 2 is normally moved to hold the cam 7 in contact with the abutment 7 by means of a rod 8 pivoted to the frame at 8 and extending through an eye 8 in a stud or bar l rising from the base 1 in rear of the frame. A helical expansion spring S isstrung on this rod 8 between the upright 1 and notch 8 screwed on the outer end'of rod 8. The spring being adapted to draw the frame inward and hold the cam 7 in contact with the abutment 7". d V

Attached to the forward side of the frame 2 is a bracket 2 which extends upwardly to approximately the level of the shaft 4, and it is transversely bored for the reception of a shaft 9 on which is fixed a pinion 9 that meshes with gear 4, and on the outer end of this shaft 9 is a handle 9 by which said shaft can be turned. When the handle is turned of course shaft 4 will be rotated by the intermeshing. of the gears.

On the outer end of the shaft 4 adjacent the collar 6 is a work holder or clamp 10, which may be secured to the shaft 4 by a set-screw 10 and which is provided with a slot in its inner end adapted to engage a transverse rib 6 on the adjacent end of the collar 6, so as to causethe cam holder 10 to rotatewith the shaft.

The bracket 2 may beprovided with an eye 2 which may be connected by a rod or cord 2 with a foot treadle or lever, not 1 shown, so that by depressing said treadle frame. 2 may be drawn forward so as to move the shell out of contact with the grinder, and the cam out of contact with the abutment 7", when it is desired to change the cam or adjust or rearrange the shell on the holder; or adjust the abutment.

The shell S held by the clamp is adapted to be ground by a vertically disposed, grinder G,'indicated in'Fig. 1, and which is rotated by a suitable means -(not' shown); or it may be ground by a horizontally disposed grinder G; indicated in Fig. 4, and operated by means not shown. The frame may be drawn forward by depressing the treadle (not shown) and the de sired cam attached to the shaft, and the object to be ground slipped on the holder 10 or secured thereto ;as. indicated in Figs. 1 and 4. When the treadle is released the spring 8 swings the frame toward the grinder until it is arrested by the cam 7 engaging the abutment 7 The grinding disk is rotated and the object being ground is rotated against the grinder by turning the handle 9 until it is ground to the same contour as the cam 7, as will be readily understood. By placing a cam 7 of any desired contour on the shaft 4, the shell or object on the holder 10 can be reduced to the same contour.

What I claim is:

1. In a'shell grinder the combinatidn of a swingin frame pivoted at its lower end on a suitab e support and having its upper end bifurcated, a shaft rotatably g'gimaled in and extending through the i cations of the frame, a shell holder on one end of said shaft, a shaping cam on the other end of said shaft, an abutment attached to the frame and adapted to be engaged by said cam, a spring connected with said frame and base for normally swin g the frame so as to hold the cam in yielding contact with said abutment, and means for manually rotating said shaft.

2. In a shell grinder the combination of a base, a swinging frame pivoted to said base, and a shaft rotatably journaled in and extending through the frame, a shell holder on one end of said shaft, a shaping cam on the other-end of said shaft, an abutment on the base adapted to be engaged by said cam, a spring for normally swinging the frame so as to bring the cam in contact with said abutment; -'a gear on said'shaft, a manually operable shaft mounted on said frame parallel with the first shaft, and a pinion on the manually operable shaft engaging the gear on the first shaft. t

3. In a shell inder the combination of a base, a Y shaped frame hinged thereon at its lower end and havin a bifurcated up er end, a rotatable shaft 1ournaled in the bif lircations of said frame, a shell holder on, one endof the shaft, a shaping-cam removably attached to the other end of the shaft, an abutment on the base adjacent said. cam, a

spring for yieldingly swinging said frame to hold said cam in contact with said abut- 'ment a gear on said shaft, an upstandin bracket attached to the front side of sai frame adjacent said pinion, a manually op- 'erable shaft journaled in said bracket parallel with the first shaft, and a pinion on the manually operable shaft engaging the. gear on the first shaft.

In testimony that I claim the foregoing as my own, I afiix my signature in presence 'of two witnesses.

FRANK DI GIANNI. 

